JP2005001038A - Cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting machine which smoothly carries out cutting work without damaging cutting blades. <P>SOLUTION: The cutting machine has a holding support 8 arranged at a location between a cutting object 20 and a pair of cutting blades 4, 5, in order to inhibit the application of a shearing rotational force generated at the time of cutting, to the cutting object. As a result, the cutting is carried out in a good condition in which an angle defined by the cutting blades 4, 5 and the cutting object 20 is always set to a value close to a right angle. The holding support 8 is arranged so as to be protruded from a spindle 3 that rotatably supports proximal ends of the cutting blades 4, 5, toward distal ends of the same, and formed so as to have pinching sections 8a that can pinch the cutting object 20 at the time of cutting. Further the cutting machine is provided with a rotation bearing ring 9 which is rotatable about a longitudinal center shaft thereof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting machine used for cutting round steel and the like used for dismantling automobiles and reinforcing bars for concrete structures.
[0002]
[Prior art]
Conventionally, as such a cutting machine, for example, as disclosed in Patent Documents 1 and 2, a type of cutting a workpiece by rotating and closing a pair of cutting blades around a support shaft is known. Yes.
[0003]
7A and 7B are explanatory views showing the structure of a conventional cutting machine according to this method, in which FIG. 7A is a perspective view and FIG. 7B is a front view schematically showing a situation at the time of cutting. In the conventional cutting machine shown in the figure, a support shaft 3 is mounted on a bracket 2 provided in a cutting machine body 1, and a base end portion of a pair of cutting blades 4, 5 is pivoted on the support shaft 3. It is supported. The workpiece 20 is cut by rotating and closing the pair of cutting blades 4 and 5 around the support shaft 3.
[0004]
[Patent Document 1]
JP-A-9-57523
[Patent Document 2]
JP-A-9-248711 [0006]
[Problems to be solved by the invention]
However, in such a conventional cutting machine, if the workpiece 20 is not firmly supported at the time of cutting, as shown in FIG. , That is, the rotational force indicated by A and B in the shear direction with respect to the longitudinal axis L1 of the workpiece 20 in the figure cannot be restrained, and the workpiece 20 and the cutting blade 4 are cut. It often happens that it is sandwiched between the blade 5 and cutting becomes impossible. In this state, if the cutting is further continued, a lateral load is applied to the side surfaces of the cutting blades 4 and 5 and damage may occur.
[0007]
Moreover, the conventional cutting machine has a hanging hook of a pneumatic weightless carrier (balancer: trade name) that holds the cutting machine body on a hanging ring (locking tool) fixed to the cutting machine body. It is often used in a state where it is locked and suspended. Although it is easy to move the cutting machine main body in this state, the attachment point of the locking tool to the cutting machine main body and the locking point of the locking tool locked to the hanging hook are separated from each other. Therefore, when tilting the cutting machine main body, the operator needs to perform the work of lifting the rear part of the cutting machine main body or pushing it down to align the cutting blade with the cutting part of the workpiece. In a dismantling operation such as an automobile having a complicated structure, it is necessary to change the cutting position and direction in a complicated manner, so that there is much accumulation of fatigue and it is difficult to increase the working efficiency.
[0008]
A first object of the present invention is to provide a cutting machine capable of smoothly performing a cutting operation without damaging a cutting blade.
[0009]
A second object of the present invention is to provide a cutting machine that can freely change the cutting direction and can efficiently cut a workpiece having a complicated shape and arrangement.
[0010]
[Means for Solving the Problems]
In the cutting machine provided with a pair of cutting blades for cutting the object to be cut, the first subject is formed by forming each of the opposed blade parts of the pair of cutting blades into a concave arc shape and cutting the object to be cut. The object to be cut is guided to the base end side of the cutting blade, and a holding support is provided to stop the rotational force between the object to be cut and the pair of cutting blades generated at the time of cutting. The problem was solved by making it possible to cut in a good state where the angle of the cutting blade was always close to a right angle.
[0011]
As a holding support for efficiently holding an object to be cut, various types of holding supports can be considered. From a support shaft that rotatably supports a base end portion of a pair of cutting blades toward a tip side of the cutting blade. Protruding and provided so as to be located behind the cutting center of the pair of cutting blades, and having a holding part capable of holding the object to be cut at the time of cutting or a holding surface capable of restraining the longitudinal rotation of the object to be cut Is preferred. Furthermore, it is preferable to provide the tip of the holding support in the vicinity of the support shaft. Thereby, while being able to cut | disconnect a to-be-cut object efficiently, the effect of a holding | maintenance support can be exhibited more effectively.
[0012]
In addition, the second problem is that a rotation support ring that rotatably supports the cutting machine body around the central axis of the cutting machine body is mounted at a substantially center of gravity position on the outer peripheral surface of the cutting machine body. This problem has been solved by attaching a locking tool that can be tilted to the dynamic support ring and that can be locked to a hanging tool for hanging the cutting machine body. As a result, the shearing direction of the cutting blade of the cutting machine can be freely changed by 360 degrees, and a workpiece having a complicated shape and configuration can be efficiently cut.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on examples.
[0014]
FIG. 1 is a perspective view showing an embodiment of the present invention. In the present embodiment, an example is shown in which a hydraulic cylinder is used as cutting power, and the power applied by the hydraulic pressure is transmitted to a cutting blade via a link mechanism to perform cutting.
[0015]
As shown in FIG. 1, a support shaft 3 is attached to a bracket 2 provided at the tip of a cylindrical cutting machine main body 1, and the base end portions of a pair of cutting blades 4 and 5 are rotatable on the support shaft 3. Is pivotally supported. A hydraulic direction switching valve 6 a of the hydraulic cylinder 6 is attached to the proximal end side of the cutting machine body 1, and the hydraulic power is transmitted to the cutting blades 4, 5 via the link mechanism in the link mechanism storage cylinder 7. The object to be cut is cut by rotating around the support shaft 3 and closing it. A holding support 8 is integrally provided at the tip of the bracket 2 to stop the rotational force between the object to be cut and the cutting blade that is generated during shearing. At the tip of the holding support 8, a holding portion 8 a is formed that can hold an object to be cut between the cutting blades 4 and 5 at the time of cutting. The tip of the clamping portion 8a is positioned closer to the base end side than the cutting center of the pair of cutting blades 4 and 5 (the position where the cutting blades 4 and 5 intersect at the end when cutting), thereby securely holding the object to be cut. I can do it.
[0016]
The opposed blade parts of the cutting blades 4 and 5 are each formed in a concave arc shape, and the curvature thereof is formed so as to decrease from the distal end side toward the proximal end side. Thus, the workpiece is guided toward the proximal end side of the cutting blades 4 and 5, that is, the support shaft 3 side as the workpiece is cut.
[0017]
A rotation support ring 9 is mounted in the vicinity of the longitudinal center portion (substantially center of gravity) of the cutting machine body 1, and a chain block, A locking tool (hanging ring) 10 that can be locked to a suspension hook 11b of a hoisting device 11a of a lifting device such as a hoist crane is provided. A hoist crane etc. can be installed by a well-known means.
[0018]
FIG. 2 is a partial longitudinal sectional view showing a structure for mounting the rotation support ring 9 to the cutting machine main body 1. As shown in the figure, the rotation support ring 9 is attached to the cutting machine main body 1 via a bearing 9 a, whereby the rotation support ring 9 rotates about the central axis of the cutting machine main body 1. It is possible. That is, when the rotation support ring 9 is suspended from the hoisting device 11a of the lifting tool 11, the pair of cutting blades 4 and 5 together with the cutting machine body 1 can displace the shear direction by 360 degrees. It has become.
[0019]
2 is a flange fixed to the other side of the inner ring portion of the bearing 9a, and is fixed to the link mechanism storage cylinder 7. What is indicated by 9c is a flange that is fixed to the rotation support ring 9 that is fixed to the outer ring portion of the bearing 9a, and that fixes the other side of the outer ring portion of the bearing 9a, and what is indicated by 9d is that of the rotation support ring 9. An insertion hole for a locking shaft 10b that connects the locking tool 10 and its seat 10a in order to make the locking tool 10 turnable in order to hold the locking tool 10 freely. Perforated. Further, when the suspension hook 11b is of a type having a rotating device, the locking tool 10 may be directly fixed to the rotation support ring 9, or a sliding bearing such as an oilless bush may be used instead of the bearing 9a. It may be provided.
[0020]
Next, as an example of cutting using the cutting machine of FIG. 1, a cutting process when a pipe is cut will be described with reference to FIG.
[0021]
As the pipe, an exhaust pipe connecting the muffler of the automobile and the exhaust gas treatment device was used.
[0022]
First, as shown to Fig.3 (a), a cutting machine main body is moved to the position which can clamp the pipe 20 which is a to-be-cut object between the cutting blades 4 and 5. As shown in FIG. In this state, when the hydraulic cylinder 6 is operated and the cutting blades 4 and 5 are closed, the pipe 20 is caught between the cutting blades 4 and 5 (see FIG. 3B).
[0023]
When the cutting blades 4 and 5 are further closed, the tips of the cutting blades 4 and 5 intersect, and the blade portion of the cutting blades 4 and 5 comes into contact with the outer peripheral surface of the pipe 20 (see FIG. 3C).
[0024]
Further, when the cutting blades 4 and 5 are closed, the curvature of the blade portion of the cutting blades 4 and 5 is formed so as to decrease from the distal end side toward the proximal end side, and the gap between the cutting blade 4 and the cutting blade 5 is the distal end side. From the difference between the cutting center (grinding center) O1 by the cutting blades 4 and 5 and the center point O2 of the pipe 20, the pipe 20 is cut. The cutting blades 4, 5 are guided to the proximal end side of the blades 4, 5, that is, toward the gripping center O 1 of the cutting blades 4, 5, and finally to the clamping portion 8 a of the holding support 8 provided at the distal end of the bracket 2. At this time, the pipe 20 is fixed because the gripping center O1 of the cutting blades 4 and 5 and the center point O2 of the pipe 20 are kept at a slightly separated position (FIG. 3D )reference).
[0025]
When the cutting blades 4 and 5 are further closed, the cutting blades 4 and 5 remain strongly pressed against the holding portion 8a of the holding support 8 while crushing the pipe 20 due to the difference between the center positions O1 and O2. The pipe 20 is cut (see FIGS. 3E and 3F).
[0026]
4A and 4B are explanatory views showing the situation at the time of cutting, where FIG. 4A is a perspective view and FIG. 4B is a front view. As shown in the figure, the pipe 20 is smoothly cut without rotating while being held by the holding support 8. In particular, in this embodiment, the pipe 20 is pinched and securely held by the pinching portion 8a provided at the tip of the holding support 8, so that cutting can be performed more smoothly.
[0027]
FIG. 5 is a side view showing another shape example of the holding support. The holding support 8 shown in FIG. 5A is provided with a semicircular recess that matches the shape of the pipe that is the object to be cut on the tip side, and the upper and lower sides thereof serve as a clamping portion 8a. The holding support 8 shown in FIG. 5B has a protrusion 8b formed only on the upper side of the tip. Even in the holding support 8 shown in FIG. 5B, the object to be cut is rotated at the time of cutting by positioning the holding surface 8c formed on the inner surface of the protrusion 8b in the rotation direction during shearing of the object to be cut. It is cut smoothly without doing.
[0028]
Further, in this embodiment, as shown in FIGS. 1 and 2, a rotary support ring 9 is attached to the cutting machine body 1, and is attached to the rotary support ring 9 via a holding base 9d so as to be freely rotatable. Since the hanging hook 11b of the hanging tool 11 is locked to the locking tool 10, the cutting machine body 1 can be rotated 360 degrees around the central axis by the rotation support ring 9, and Since the locking tool 10 can be rotated 360 degrees in a horizontal plane, the cutting direction can be freely changed.
[0029]
FIG. 6 is a perspective view showing another embodiment of the cutting machine of the present invention. The cutting machine of this embodiment is attached to the suspension support shaft 9e of the rotation support ring 9 attached to the position of the approximate center of gravity of the cutting machine main body 1 so that the end of the locking ring 12 is pivotally mounted and tilted. A locking tool is provided so that the hanging hook 11b of the lifting tool 11 that suspends the cutting machine main body 1 from the upper part of the ring 12 can be locked. The cutting machine of the present embodiment is provided with the locking ring 12, and in the locking tool 10 shown in FIG. 1, the tilting of the cutting machine main body 1 is caused by the sliding of the contact portion between the locking tool 10 and the suspension hook 11 b. What must be relied on is that the cutting machine body 1 can tilt around the suspension support shaft 9e, so that the degree of freedom of changing the cutting direction is further increased.
[0030]
In addition, what is shown by 13 in FIG. 6 is the grip for operation provided in the cutting machine main body 1.
[0031]
【The invention's effect】
According to the present invention, the object to be cut does not rotate at the time of cutting, and the object to be cut is not sandwiched between the pair of cutting blades, so that the cutting operation can be smoothly performed without damaging the cutting blade. .
[0032]
In addition, a rotation support ring that can be rotated around the central axis of the cutting machine main body is mounted on the outer peripheral surface of the cutting machine main body, and a hanging tool that suspends the cutting machine main body can be locked to the rotation support ring. By attaching the locking tool, it is possible to set the directivity in the long axis direction of the cutting machine body in three dimensions, and the shearing direction of the cutting blade can be freely changed by 360 degrees, complicated shape and complicated Even an object to be cut arranged in a state or the like can be cut efficiently.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is a partial longitudinal sectional view showing a structure for mounting a rotation support ring to a cutting machine body.
3 is an explanatory diagram showing a cutting process when a pipe is cut as a cutting example using the cutting machine of FIG. 1; FIG.
4A and 4B are explanatory views of the cutting machine of FIG. 1, in which FIG. 4A is a perspective view, and FIG. 4B is a front view.
FIG. 5 is a side view showing another shape example of the holding support.
FIG. 6 is a perspective view showing another embodiment of the cutting machine of the present invention.
7A and 7B are explanatory views showing the structure of a conventional cutting machine, wherein FIG. 7A is a perspective view, and FIG. 7B is a front view schematically showing a situation at the time of cutting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutting machine body 2 Bracket 3 Support shaft 4, 5 Cutting blade 6 Hydraulic cylinder 7 Link mechanism storage cylinder 8 Holding support 8a Holding part 8b Projection 8c Holding surface 9 Rotating support ring 9a Bearing 9b, 9c Flange 9d Holding base 9e Suspension support Shaft 10 Locking tool 10a Receiving seat 10b Locking shaft 11 Lifting tool 11a Hoisting device 11b Hanging hook 12 Locking ring (locking tool)
20 Cut object (pipe)

Claims (4)

A pair of cutting blades provided with a pair of cutting blades pivotally supported on a support shaft and cutting the workpiece by rotating and closing the pair of cutting blades about the support shaft. Are formed in a concave arc shape, and the workpiece is guided toward the base end side of the cutting blade along with the cutting of the workpiece, and the workpiece and the cutting blade that are generated at the time of cutting, A cutting machine characterized in that a holding support is provided to stop the rotational force between the two. 2. The cutting machine according to claim 1, wherein the holding support protrudes from the support shaft toward a distal end side of the pair of cutting blades and is located on a proximal end side from a cutting center of the pair of cutting blades. The cutting machine according to claim 1 or 2, wherein the holding support has a holding portion that can hold the object to be cut at the time of cutting or a holding surface that can prevent rotation of the object to be cut in the longitudinal direction. A rotation support ring that rotatably supports the cutting machine body around the central axis of the cutting machine body is mounted at a substantially center of gravity position on the outer peripheral surface of the cutting machine body provided with the pair of cutting blades. 4. The locking device according to claim 1, wherein the support ring is provided with a locking tool that tiltably supports the cutting machine main body and that can be locked to a hanging tool for hanging the cutting machine main body. Cutting machine.

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